Sian is a distinctive girls' name in United States, ranking #6763 in 2000 with 16 recorded births. The name reached its all-time peak in 2006 with 35 births ranking #4252. Since 1996, the popularity has increased by 45.5%. In 2000, approximately 1 in every 113,498 girls born was named Sian. FALLING Recent data shows the name is currently falling.